Hamlet e



(No Model.)

H. E. FORREST.

PACKING FOR STUFPING BOXES.

No. 445,693. Patented Feb. 3,1891.

' ilivrTnn STATES PATENT Trice.

I-IAMLET E. FORREST, OF NEW YORK, N. Y., ASSIGNOR TO VVATSOR (it STILLMAN, OF SAME PLACE.

PACKING FOR STUFFlNG-BOXES.

SPECIFICATION forming part of Letters Patent No. 445,693, dated February 3, 1891.

Application filed July 25,1890. Serial No. 359,895. (No model.)

To all whom it may concern:

Be it known that I, HAMLET E. FoRREsT, of the city of New York, in the county and State of New York, have invented a certain new and useful Improvement in Packing for Stuffing-Boxes, of which the following is a specification.

My invention relates to an improvement in packing for stuffing-boxes, the object being to provide means for preventing the escape of steam or other fluid from the cylinder to the outside of the packing at the point where the packing engages the stuffing-box, and to further provide for the adjustment of the packing to stuffing-boxes in which the seats are more or less irregular through wear or other causes.

A practical embodiment of my invention is represented in the accompanying drawings, in which- Figure 1 represents a sectional view of a stuffing-box, gland, and packing, with the rod therein; and Fig. 2 is a sectional view in detail of a two-part valve-ring.

A represents the stuffing-box, and B the gland for securing the packing within the stufling-box. The main body of the packing is composed of separate rings 0, of well-known construction, having their adjoining sides beveled in order to adjust themselves in position to form an effectivestop for the steam or other fluid which may tend to escape from the cylinder alongside of and in immediate I proximity to the piston-rod D and held in position by suitable springs c. The springs c are preferably located between the flange G on the gland B and the heads of the fastening-bolts g, but may be inserted between the sets of packing, as is common.

To guard against the liability of the steam or other fluid escaping through the end of the stuffing-box along the space cl, which it is found desirable to leave for any lateral vibration or play of the piston-rod into the space 1), between the wall of the stuffing-box and the outside of the packing O, I provide a valve-ring E, having its extreme diameter less than the diameter of the interior of the stuffing-box and having its interior fitted as closely as may be to the piston-rod. The valvering E has its upper face beveled, as shown at e, for receiving the beveled edges on the rings 0.

The valve-ring E is seated upon a seat-ring f. The upper flat face of the seat-ringfis fitted, preferably by agroundjoint, to the under flat face 6 of the valve-ring E, and the lower face of the said seat-ring is adapted to rest in the end of the stuffing-box, where .it may be made tight by the interposition between it and the end of the stufling-box of a suitable cement or packing-such, for instance, as whatisknown as usudurian. In order to insure atight joint between the seatring and the end of the stuffing-box F,Iprovide the bottom of the seat-ringf with a bevel slightly greater than that of the end of the stuffing-box F, so that its inner edge will be sure to seat in close contact with the inner edge of the end F, the space between it and the end of the stufflng-box where it recedes therefrom being tightly closed by the cement or packin The exterior f of the seat-ring f is fitted as close as may be to the Wall of the smiling-box for the purpose of preventing any considerable lateral vibration of the seatring. Theouter margin of the upper face of the seat-ring is cut away, as shown in Fig. 1, so as to leave the annular fiat seat upon which the valve-ring rests substantially the same width as the lower bearing-surface on the valve-ring.

\Vhile the valve-ring E is held in place under the press re of the springs and effectually prevents the escape of the steam or fluid under normal pressure, it may be lifted by any water collected in the cylinder and forced against it by the piston.

What I claim as my invention is The combination, with the stuffing-box, the piston-rod, and the packing, of the valvering at the end of the packing, the seat-ring having one face upon which the valve-ring has a sliding engagement, and its opposite face toward the end of the stufling-box adjacent to the cylinderhead being beveled, so as to irecede from its seat as it extends outwardly Wall of the stuffing-box, substantially as set from the piston-rod and form a space for cen1 forth.

ent or permanent packing, and its face 00- i 1 Ward the valve-ring being of substantially HAMLET LORRESI the same width as the adjacent face of the Vitnesses:

valved'ing, the outer margin of its said upper FREDK. HAYNES,

bearing-face being spaced from the inner K. E. PEMBLETON. 

